Any Carbon will do to clear up water cloudiness and remove organics. The Chemipure just has some extra Resins in it.
Filter sock will remove large particulates.
Not sure what your sump/filter looks like, but put two baggies of Carbon in (back the carbon so it doesn't make a mess). One at the output of your tank (maybe inside the sock for good flow thru) and another to polish up water just before going back to tank. The first one will dirtier and used up quicker. Then 2nd will last longer.
Clean the sock whenever it starts getting plugged, by rinsing it reversed under strong tap water. Maybe even a brush to help clear out the pores.